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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 88 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.93² =
  2. 2.94² =
  3. 3.42² =
  4. 4.51² =
  5. 5.83² =
  6. 6.98² =
  7. 7.32² =
  8. 8.37² =
  9. 9.86² =
  10. 10.71² =
  11. 11.65² =
  12. 12.55² =
  13. 13.85² =
  14. 14.95² =
  15. 15.99² =
  16. 16.53² =
  17. 17.38² =
  18. 18.31² =
  19. 19.47² =
  20. 20.96² =
  21. 21.63² =
  22. 22.66² =
  23. 23.91² =
  24. 24.48² =
  25. 25.81² =
  26. 26.41² =
  27. 27.52² =
  28. 28.34² =
  29. 29.69² =
  30. 30.77² =
  31. 31.89² =
  32. 32.78² =
  33. 33.97² =
  34. 34.75² =
  35. 35.56² =
  36. 36.39² =
  37. 37.79² =
  38. 38.43² =
  39. 39.92² =
  40. 40.61² =

Answer key

  1. 8649
  2. 8836
  3. 1764
  4. 2601
  5. 6889
  6. 9604
  7. 1024
  8. 1369
  9. 7396
  10. 5041
  11. 4225
  12. 3025
  13. 7225
  14. 9025
  15. 9801
  16. 2809
  17. 1444
  18. 961
  19. 2209
  20. 9216
  21. 3969
  22. 4356
  23. 8281
  24. 2304
  25. 6561
  26. 1681
  27. 2704
  28. 1156
  29. 4761
  30. 5929
  31. 7921
  32. 6084
  33. 9409
  34. 5625
  35. 3136
  36. 1521
  37. 6241
  38. 1849
  39. 8464
  40. 3721

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